Research On Temporary Protection Of Power Systems Based On FPGA Device

Nowadays, with the constant expansion of the grid scale, higher and higherrequirements about the security and reliability of the power system are put forward.The power system operation process is often accompanied by a variety of failures andabnormal running state, which once occurs, will have an impact on the grid, even tothe degree of causing paralysis of the entire network, interrupting users’ power supply,reducing power quality and damaging the device when serious. These will have anegative impact on the economic development. Therefore, the electric power systemneeds a kind of device that is able to quickly and accurately indicate the power systemfault as well as the abnormal running state, and activate the circuit-breaker, or sendthe trip signal. Hence the power system relay protection device plays an importantrole in maintaining the security and stability of running.In this paper, the design of the temporary protection device has a solid theoreticalfoundation as a support, so the emphasis is on the economy and portability of thedevelopment and design of the device. First, based on in-depth understanding of thebasic temporary protection theory, this paper puts forward the reasonable protectionalgorithm and describes the device’s software and hardware systems. As thetemporary protection device is in the complex electromagnetic environment of thetransformer substation, the electromagnetic interference interferes with the device andeven causes the malfunction of the device, so in addition to the analog filtering, thispaper also introduces the use of economical software filter, which turned out to have avery good filtering effect. From the point of view of EMC design, the device’scapability of resistance to interference was enhanced. The device not only had somebasic electrical and mechanical protection functions, but also became easy to installand convenient to carry. Finally, the FPGA-based temporary protection device wasdesigned. After commissioning, the all-round performance tests were carried out atthe scene, and the results showed that they met the design requirements, which spokevolume for the feasibility and practicality of the scheme.